If this is the indication the battery is being charged, it's likely you need a new battery for the camera. (never being fully charged). Try running it all the way down and recharging it a couple times to see if this refreshes the battery. If it's a Nicad, this may work. Lithium? Forget it and get a new battery.

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Although the manuals nothing says about flashing red light on charger, my best guess is the battery is defect.
Try to remove the battery several times and start the charging again and again. But when after a few attempts the LED starts flashing again, you better buy a new battery. When you don't use the camera for a longer period, make it a habit, to charge the battery every 3 months or so.

A red light indicates the charger is charging the battery, an amber light means it has switched from fast rate charging to trickle to keep the battery topped off, and green would mean the battery is completely charged. But don't be fooled waiting for green, many times the charger will only be on green for a moment before changing to amber and keeping the battery topped off.

Flashing can be a sign of a problem on some chargers.

A rapid flashing red can on some chargers indicate a bad or shorted battery, or a bad battery contact in the charger itself. If in question, try a different battery on the charger or compare with another charger to determine if the blinking is normal.

The pcb inside the battery has a microcontroller that monitor the
charges and charge cycle. When the cell falls below a certain voltage,
it will instruct the charger not to charge and will show with a
red-green flashing light. If the battery has been tried 3 times in
succession then the pcb will brick itself from the makita charger. So
first replace the bad cells. There are 2 solutions at this moment:
charge with a 3rd party lithium charger like the imax b6 or replace the
pcb with a working one. check out my blog on
http://mkbl1830.blogspot.com/

My charger blinks red and green but I've literally only used my chainsaw 4 times. It's less than a year old. It won't charge the battery. What could be the issue? Or can I take it back to home Depot and use the warranty? Any help will be welcome.

Charger flashing red indicates the battery is still not full and is in the process of recharging.Red light steady indicates your battery is fully charged and ready to operate with your Coolpix 5000.When red light is off it indicates there is no battery inserted or the charger is not pluged in.

Ridgid charger lights read as follows: Solid red; charger has power. Flashing red; charger is evaluating the battery, checking if it's cool enough to charge and if it is in chargeable condition. If the battery is hot, i.e. just came off the tool after extended use, it won't charge the battery until it cools down. Flashing red & green; the battery is defective and the charger will not charge it. Solid red & flashing green; battery is charging. Solid green; battery is full.

I had the exact same problem so I went searching for an answer. Here's what I found and it really did work. I had to do it about 7 times... and I read others had to do it about 20 times. But worked for them as well. Good luck!!

My NP 20 gave me the flashing red light of death and I got Casio to replace it. Then I had the same problem with my second NP 20 so I dug around for a way to fix it and I found the following advice on a site called FixYa. It worked instantly and I didn't risk ruining my battery. ylu1 writes: I had the same problem as this. what i did was... i kept putting the battery on the charger then took it off as soon as the red light came on. i did this about 6 times. doing this puts a bit of charge in the battery each time before the charger starts to flash. after the battery as got enough charge in it it can start to charge. hope this helps.

@gminvite1"Another way I found was when this happens, to push the battery to the
point the light will turn on, when it starts flashing slide it off then
back on. Do this a few times so it charges a little, then you should be
fine to leave it on."

I tried to do this with my LI-10C Olympus charger and it worked..The blinking red light turns to solid red..Thanks for the info...Now I won't be bothering to buy a new batt.or have my charger checked..